For Japanese , COCORO is the best top 3 Japanese restaurant in London.
Our Japanese company use this for business meeting dinner , so I go there very often during weekday , and weekend with my family.
Always we book at basement , they have very nice table there , take shoes off and sitting at Japanese style bench seat . I fell I am in Japan. waitress are pretty and good services. Foods is very nice
Specially RAMEN noodle is the best in UK , out colleague says so ,
I recommend cocoro and book at least 1 week before. Always the basement is full of Japanese people .